Grammarist is a professional online English grammar dictionary, that provides a variety of grammatical tools, rules and tips in order to improve your grammar and to help you distinguish between commonly misspelled words.

Note: Many of the entries here will eventually become full-length posts. Some are rough and have not been fully researched. If you have any corrections or would like to add anything, please comment.
Radios: not radioes.
Rainwater: The one-word spelling is accepted, but it is commonly spelled rain water.
Rancor vs. rancour: rancor in American English; rancour everywhere else.
Randomise vs. randomize: In the U.S. and Canada, it's randomize, randomized, randomizing, randomization, etc. … [Read more...]

Note: Many of the entries here will eventually become full-length posts. Some are rough and have not been fully researched. If you have any corrections or would like to add anything, please comment.
Paediatrics vs. pediatrics: pediatrics in North America; paediatrics outside North America. The spelling distinction extends to all derivative words.
Paid vs. paying: A paying customer is a customer who has paid. A paid customer is bad for business.
Paraphernalia: personal belongings or … [Read more...]

Note: Many of the entries here will eventually become full-length posts. Some are rough and have not been fully researched. If you have any corrections or would like to add anything, please comment.
Oasis: plural oases.
Off (first off, second off, etc.): First off, second off, etc. mean the same as first of all, second of all, etc., but they are more colloquial.
Once and a while: mondegreen for once in a while.
Once in a lifetime vs. once-in-a-lifetime: Hyphenate it if it comes … [Read more...]

Note: Many of the entries here will eventually become full-length posts. Some are rough and have not been fully researched. If you have any corrections or would like to add anything, please comment.
Nascent: just coming into existence, emerging, or being born.
Nemesis: (1) an agent of retribution or vengeance, (2) a source of harm or setbacks. The plural is nemeses (a very welcome irregular plural, as nemesises doesn't exactly roll off the tongue).
Neutralise vs. neutralize: In the U.S. … [Read more...]

Note: Many of the entries here will eventually become full-length posts. Some are rough and have not been fully researched. If you have any corrections or would like to add anything, please comment.
Machiavellian: marked by cunning trickery, especially in politics or government.
Machine gun vs. machinegun: machine gun is two words as a noun phrase; machinegun is the verb for to shoot with a machine gun.
Make pretend: make it pretend or make believe.
Make up vs. makeup: make up is the … [Read more...]

Note: Many of the entries here will eventually become full-length posts. Some are rough and have not been well researched. If you have any corrections or would like to add anything, please comment.
Jam: One's jam is a song, especially one that is soulful or has a beat, that has special meaning, inspires deep feelings, or inspires dancing.
Jinx: to give bad luck.
Jones: to have a strong desire for something. One who is jonesing for something is filled with obsessive want. The word is … [Read more...]

Note: Many of the entries here will eventually become full-length posts. Some are rough and have not been fully researched. If you have any corrections or would like to add anything, please comment.
Ibid.: abbreviation of Latin ibidem, meaning the same place. It's used in footnotes, endnotes, and citations to refer to the preceding note.
Iconic: originally meant bearing great symbolic weight or representing its time or place. But now it's usually just a synonym of famous.
Ideation: the … [Read more...]

Note: Many of the entries here will eventually become full-length posts. Some are rough and have not been fully researched. If you have any corrections or would like to add anything, please comment.
Halcyon: calm and peaceful.
Hands-on: When it functions as an adjective (e.g., the activity was hands-on), give it a hyphen.
Happy median vs. happy medium: Happy median makes sense logically, but happy medium is the common phrase meaning a course or solution that avoids … [Read more...]

Note: Many of the entries here will eventually become full-length posts. Some are rough and have not been fully researched. If you have any corrections or would like to add anything, please comment.
Gage, gauge, gouge: Gage is rare. It means something given as security for an obligation. Gauge relates to measurements. Gouge relates to chiseling, scooping, and digging.
Galumph: a verb meaning to move clumsily.
Gambol: (to playfully skip or frolic about) makes gamboled and gamboling in … [Read more...]

Note: Many of the entries here will eventually become full-length posts. Some are rough and have not been fully researched. If you have any corrections or would like to add anything, please comment.
Face lift, face-lift, facelift: All three forms are common, but the one-word form will win in the end.
Facetious vs. fatuous: Facetious: jocular or sarcastic, often but not necessarily in a mocking way. Fatuous: smugly foolish.
Faeces vs. feces: feces in North America; faeces everywhere … [Read more...]